[PATCH 1/3] Use roundown_pow_of_two() in zone_batchsize()

[David Howells <dhowells@redhat.com>]

Use roundown_pow_of_two(N) in zone_batchsize() rather than (1 << (fls(N)-1))
as they are equivalent, and with the former it is easier to see what is going
on.

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Lanttor Guo <lanttor.guo@freescale.com>
---

 mm/page_alloc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)


diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e2f2699..8add7da 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2706,7 +2706,7 @@ static int zone_batchsize(struct zone *zone)
 	 * of pages of one half of the possible page colors
 	 * and the other with pages of the other colors.
 	 */
-	batch = (1 << (fls(batch + batch/2)-1)) - 1;
+	batch = rounddown_pow_of_two(batch + batch/2) - 1;
 
 	return batch;
 }